Bunsen burner



C. M. JOHNSON.

' BUNSEN BURNER. I APPLICATION FILED AUG. 7, 1919.

Patented June 8, 1920.

FIELEL FIBJ.

1 an I FIEH. FIE-3.5.

' UNITED STATES PATENT, OFFICE.

CHARLES M. JOHNSON, F AVALON, PENNSYLVANIA.

BUNSEN' BURNER.

To all whom it mar concern."

Be it known that 1, CHARLES 'M. JOHN- soN, residing at Avalon, in the county of I Allegheny and State of Pennsylvania, a

citizen of the United States, have invented or discovered certain new and useful Improvement in Bunsen Burners, of which the construction of Bunsen burners, and

more particularly of burners of the type commonly known as Chaddock burners. These Chaddock burners are made of earthenware, and consist of two parts or members, a base member and a top member,

separable and replaceable the one with re' spect to the other. They are extensively used in metallurgical laboratories, where relatively high and widely-ranging temperatures are required. My invention is not limited in the matter of material, but earthenware has its practical advantages for such use as I have indicated; and, in the field of earthenware, I preferably employ a mixture of good refractory plasticclay and zirconium oxid. This mixture is one which I have developed and perfected; it forms no part of my present invention; and here it will suffice to say that in such mixture the zirconium oxid content may advantageously in size equal or exceed the clay content.

The burner of my invention is illustrated in the accompanying drawings, of which Figure 1 is a view in side elevation of the base member alone; Fig. 2- is a like view of the base member with one of a plurality of top members applied to it; Fig. 3 is a like View of the base member with another of the plurality of top members applied to it; Fig. 4 is a like view of the three members shown in Figs. 1, 2, and 3, assembled in one arrangement; Fig. 5 a like view of the same three members assembled in another arrangement; while Figs. 6 and 7 are views in central vertical section of the burner parts assembled in Figs. 4 and 5.

The burner consists essentially of three .parts or members; a base member, 1, and

two top members, 2 and 3. The base memher is provided with the usual central vertical gas duct 4 (Figs. 6 and 7 to which gas has entrance through the lateral duct 5. An air duct 6 also (one or more may be member terminates above in an extremity 7 Specificationof Letters Patent.

Patented June 8, 1920.

Application filed August 7, 1919. Serial No. 315,810.

of reduced diameter, to form a seat for the top members, applied alternately. This extremity 7 is provided with one or more aira'dmitting notches 8. While improved in design, this base member is, in its essential features, the base member of the Chaddock burner mentioned above.

The two top members are so far identical that each is of circular cross section, is provided with a flaring interior duct or chamber open through the member as shown, and is adapted to be seated by its smaller end upon the upper extremity of the base member 1, as shown in Figs. 2-7. Either top member when so applied forms, with the notches 8 of the base member, air ducts which lead into the combustion chamber, which the upwardly enlarging duct in the top constitutes, when the top member is so applied. As thus far described, the new feature is the plurality of top members; otherwise, the structure is in essential features that of the Chaddock burner.

The burner so assembled, by the application of one of the said top members, as shown in Figs. 2, 3, is for some kinds of service complete. The gas burns in the flaring duct or chamber in the top, and this chamber then becomes indeed a reverberatory chamber of heat-confining material, to bring to relatively high temperature a crucible or other article resting within or upon said top member. The larger rim of one or both of these top members may be toothed, as shown in Fig. 3, to permit the free play of flame upon an article resting on its rim.

The two tops are so related in the size of their larger rims that one may rest upon the other, as shown in Fig. 4. When so arranged, the chambers within the two tops cooperate to form a muffle or reverberatory furnace .chamber with a chimney above, within which articles may be subjected to high and steady temperatures for relatively long periods.

Again, the two tops may be assembled one with another and both with respect to the base member, as shown in Fig. 5, in which arrangement the uppermost part may constitute a separable carrier for thearticle undergoing heat treatment; it sometimes is a convenience to so increase the height of g the burner. provided) is formed in the base. The base It is possible, by forming cooperating notches in the smaller rim of the top memopening to the chamber within the burner her, as indicated at 9 in Fig. 5, to vary (by turning the top member-upon itsseat in the bottom member) the size of the air ducts top, and so control the combustion and cor respondingly the intensity of the flame,-or to vary the air supply to suit variations in rate or quality of the gas supply.

I claim as my invention:

1. In a Bunsen burner, the combination, with a base member having a central gas duct, and a seat for a top member at its upper extremity, said seat being provided with an external notch, of two top members; each of said top members being of circular cross section and provided with a widening central passageway or chamber, each adapted to be applied at its narrow end to, and to be borne upon, the seat formed in said base member, as aforesaid, and to constitute with the notches therein air ports opening into the chamber within, the said burner serving complete with one or the other of said tops, or with both, the second of said tops when employed being applicable in alternate positions to the first, to constitute with said first top either a muflle, or a support for an article to be heated, substantially as described;

2.In a Bunsen burner, the combination, with a base member having a central gas duct and a seat for a top member at its up per extremity, of two top members, each of said top members being of circular cross section and provided with a widening central passageway or chamber, each adapted to be applied at its narrower .end to, and to be borne upon, the seat formed in said base men1be1",-as aforesaid, and the one adapted to be seated by its wider end in the wider end of the-other, substantially as described;

3. In a Bunsen burner, the combination,

with a base member having a central upward-opening gas duct and notched externally at its upper end, of a top member of circular cross section and provided with a widening central passageway or chamber, the said' top member adapted-to be seatedby its narrower end upon the upper extremity of said base member and adapted to rotate upon said base member when so seated, and said topmember'beingnotched at such narrower end, substantially as described.

4. A Bunsen burner, including a body having a base, a central gas duct, and a flaring'top, and arem'ovabl'e top member of circular cross'section provided with a widening central passageway 01' chamber" and applicable to the flaring top of the burner in either of two alternate positions, and when applied constituting together with such flaring top either a mufll'e or a support for an article to be heated, substantially as described. M e

In testimony whereof I have hereunto set myh'an'd; V a y A V 3 CHARLES M. JOHNSON Witnesses:

AmoE'A. TRILL, Fn'Ai rors J. ToMA'ssoN. 

